SpaceX sits in good company. It is a Californian technology start-up that is revolutionising the industry in which it operates. That sentence could easily describe Apple, Google, Amazon, or many other companies. But SpaceX aren’t in the business of building computers, providing search engines, or offering inexpensive consumer goods. They build spaceships. They build rockets. And they build them well. They build them so well that the Germans ask how they can make them so efficiently, and the Chinese want to know how they make them so cheaply.